基于谱相关密度组合切片能量的滚动轴承故障诊断研究

包络解调分析方法是滚动轴承等旋转机械故障诊断的常用方法。当轴承滚动体发生故障时,由于其同时与轴承外、内圈接触,以及受保持架转速的影响,包络解调分析方法通常不能很好提取出滚动体故障通过频率。据滚动轴承发生故障时呈现出的二阶循环平稳特征,提出了基于二阶循环统计量的谱相关密度组合切片能量的滚动轴承故障诊断方法。此方法在一定程度上解决了包络解调分析方法在滚动体故障诊断方面的缺陷,对轴承滚动体的故障诊断具有一定的借鉴意义。

Fault diagnosis of rolling bearings based on slice energy spectral correlation density

When fault arises in rolling bearing the envelope demodulation analysis is the most commonly used method. However, when rolling element fault arises in rolling bearing the envelope demodulation analysis method could not extract the ball fault characteristic frequency perfectly due to the rolling elements’ contact with the outer race and inner race simultaneously. Besides, it is also influenced by the rotation of the cage. Taking advantage of the property of cyclostationarity when fault arises in rolling bearing, the paper proposes a fault diagnosis method of rolling bearing based on slice energy spectral correlation density (SESCD). The proposed method solves the above defect of envelope demodulation analysis in fault diagnosis of rolling element to some extent and has a degree of significance in fault diagnosis of rolling element.